Basically, all I have room for is two loops. Absolutely no room for a turntable or a wye. Tried, but it was really a "no go" from the start.
Manually turning these modern engines around is a nuisance! They are a real handful, what with tethers and the like. I don't do it often.
Signals: You have to commit to a direction the trains will be traveling BEFORE installing them.